A consumer advocacy group feels that Walmart provides a less safe shopping environment than Target ...

  

A consumer advocacy group feels that Walmart provides a less safe shopping environment than Target. To try to prove their point, they randomly selected 21 Walmart stores and found the annual number of crime reports filed for these stores. Each of these Walmart stores was then paired with a Target store within a 10 mile radius, and the annual crime reports for the associated Target stores were also recorded. The data is shown below. Test to to see if the mean number of crime incidents at Walmart stores is significantly larger than the mean number of crime incidents at Target stores. Please note the data shown below is not real, but if you would like to see the real example, check out walmartcrimereport.com. Unfortunately, the real data was collected in a way that was not fair to Walmart. Assume normality.

Walmart,Target

738,790

606,592

1033,965

952,952

1224,1194

694,539

770,722

809,763

822,750

919,971

859,892

663,656

907,863

746,742

496,435

657,616

822,766

690,662

771,800

841,777

817,830

A) What is the test statistic? Give your answer to four decimal places

B) Using a 0.05 level of significance, what is the critical point for this test? Give your answer to four decimal places.